RESEARCH OF THE METHODS OF RESTORE THE HOLES OF BODY PARTS BY INSTALLATION OF FOLDING BUSHES ON GLUE

Abstract

The paper presents the results of research on methods of restoring the holes of body parts. The prospect of introducing into production the technological process of restoring the activated landing holes of body parts by installing collapsible sleeves on glue has been established. During operation, transmission units are responsible for 20 to 40% of all failures, and body parts account for about 16%. The highest repeatability of defects is characteristic of mounting holes for bearings and cups. The choice of recovery method depends on many factors. To implement each method of recovery, various designs of equipment and devices have been developed and implemented, which allow the most complete implementation of one or another method. The proposed method of restoring landing holes in body parts by installing collapsible sleeves on glue with subsequent rolling. The purpose of rolling is to increase the strength of the bushing in the housing due to the complete filling of micro-uniformities with glue; creation of residual compressive stresses in the case. During rolling, the density of the joined surfaces increases, the nominal size of the landing hole is reached, and the roughness class of the bushing surface increases. In the process of rolling, not only the roughnesses of the processed surface, but also the sublayer of the metal that carries them are plastically deformed. In the zone of contact with the deforming rollers, plastically directed flow of metal takes place, which is accompanied by smoothing of the inner surface and simultaneous mutual contact of the microreliefs of the outer surface of the sleeve and the opening of the case.